package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    private static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    @Override
    public User wxLogin(String code) {

        //调用微信api获得openid
        String openid = getOpenid(code);
        //判断openid是否为空
        if(openid==null||openid.isEmpty()){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断是否为新用户
        User user = userMapper.getByOpenid(openid);
        if (Objects.nonNull(user)) {
            return user;
        }
        //若是新用户，完成注册逻辑
        user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
        userMapper.insert(user);
        return user;
    }

    private String getOpenid(String code){
        //调用微信api获得openid
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");

        String jsonResult = HttpClientUtil.doGet(WX_LOGIN_URL, map);
        JSONObject jsonObject = JSON.parseObject(jsonResult);
        String openid = jsonObject.getString("openid");

        return openid;
    }
}
